| 摘要 |
PROBLEM TO BE SOLVED: To provide an ultrasonic vortex flowmeter, which is easily assembled and in which the width of the propagation route for ultrasonic beam for stably detecting Karman vortices, while stably fixing a piezoelectric element, is controlled so as to suppress variations in the flowmeters. SOLUTION: In the ultrasonic vortex flowmeter, an ultrasonic transmitter 6 (ultrasonic receiver 7) is composed of the piezoelectric element 6a (7a) and a tube-wall section (propagation section) 33 (34), wherein a gap section and a propagation limiting section are formed. As a result, transmission (reception) of ultrasonic waves having sharp directivity can be achieved through the propagation limiting section in the tube-wall section (propagating section) 33. COPYRIGHT: (C)2006,JPO&NCIPI
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